Ok, i have a greddy kit, type 31 intercooler and hondata. I tuned the hondata back in the early spring for 10psi. It pulled hard as hell, and never pinged at all. Well, the past 2 weeks its been about 95 degrees here, and I am pinging above 6500 rpm at 8psi and higher. I am running 93 octane. Here's what I've tried already: added octane booster, checked plugs, checked wires, added oil, raised fuel pressure, retarded the timing 1.7 degrees per pound of boost, added 5 % more fuel in the pinging area( was already rich). I did all this yesterday, then went for a test drive. For the first 3 runs the car pulled harder at 9si than i remembered it pulling before at 10psi, like jerk your neck, tires spinning in 3rd, fast. And no pinging, then on the 4th pull it started pinging again. Got home, popped the hood, charge pipe is redhot, intake manifold is usually just a bit warm, it is also extremely hot. Seems like my intake temps are just getting too high, but my concern is why? Shouldn't be heat soaked after 3 pulls (5 mins of driving) should it?? Any ideas from you guys who deal with the temps out in Cali and Texas?? On a side note, my friend told me he didn't think it was detonation because the popping noise is coming from my exhaust, not the engine compartment, but the car bogs big time when the pinging occurs, and I'd hate to be wrong if it is detonation.
Edit: Forgot to mention, my engine temp gauge never goes past 1/2, and i'm running redline coolant and oil.

 

If it bogs, it shouldn't be detonation - I think there's a good chance you're running too rich. Have you by any chance tested your AF ratio with a wideband?

 

 

my pipes get heat soaked becasue the at in contact with my radiator hose. after i wraped them both with pipe insulation it drove like a brand new car. when does your vtec kick in? about the same rpm you bog in

 

I've got my VTEC at about 4950 right now, full boost is about 5100, bog doesn't start until about 6500 rpm. I'm gonna take off my bumper and try to see where the charge pipe could be getting heated up.

 

Any other ideas?

 

Get on a wideband o2 sensor. That will take care of it.

 

Damn, your car runs really lean after like 6k or so, I would imagine the temps start to rise due to the fact that you are running lean. Have you ever thought of water or alcohol injection? That will significantly lower the intake temps, acting as a safegaurd against detonation.

Other than that, I'm not too sure on what could be your problem. How does it act at night when its cooler?

 

The bogging doesn't sound like detonation, sounds like flooding (rich condition) The popping sound may be a small backfire from the rich condition (especially from the rear end, or even an open WG, but prolly not during boost) What did you have the boost retard set to ? When you upped it to 1.7/psi, did the bogging / 'pinging' get worse at high boost ?

If you have the KS installed, it might be retarding the car at higher rpm+boost. I would say try turning down the boost to about 6psi and test it.
Octane booster really doesn't do much at 92 or 93 octane, maybe 1-3 points more. (Don't know how good the NOS oct booster tho)

Also might want to test your knock sensor for continuity and correct output. hmmm..but a bad KS would flash the CEL... interesting...

hth
X2

 

When the temps are in the 50's and 60's the car runs absolutely amazing, perfect acceleration all the way to redline. And 7psi on a chilly evening pulls much harder than 10psi on a warm afternoon, of course. I found a guy that can make me a DIY wideband that will connect to my Hondata, so I can datalog my actual AF ratio. Hopefully it is just a tuning issue, and not something that will require too much modification. I'm gonna just run low boost and take it easy until I can pay off some stuff and get the wideband on the car. Thanks for all the suggestions guys.

 

You could heatsoak after just one run. Make sure you have a cold air intake. Running too rich can cause misfire.

Doug

 

I may be completely wrong here, but I'll throw this out anyway:

As air gets warmer it expands and therefore has less oxygen per volume (why colder air is better). In this heat your intake air temps are gunna be much hotter, so you have less oxygen entering the engine, therefore you need less fuel. So really, your probably running rich, and thats why your packfiring.

I'm not sure how much Hondata uses the air temp sensor to adjust the maps, but the stock ecu does take care of this...maybe Hondata should use it more?



[Modified by 00SilverLS, 3:38 PM 6/6/2002]

 

Sounds very good in theory. I will put my timing back to 1 degree retard per psi on the low cam and 1.3 on the high, then lean out the pinging area a bit and try it out.


[Modified by 2000Si-at-UK, 9:07 PM 6/6/2002]

 

When I had this problem it was because I got shitty fuel at the pumps (Sunoco 94). Must have been a bad batch. At anyrate I changed my fuel filter and flushed out my injectors (flowed them). When last have you changed your fuel filter? Running a colder plug won't hurt either. But I will bet its your fuel system. Change the filter and flush those injectors and you will have a more responsive car on your hands. Gap your plugs at 32 and try it again.